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<?php |
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namespace tomzx\PolicyEvaluator; |
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class Evaluator |
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{ |
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/** |
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* @var array |
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*/ |
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private $policies; |
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/** |
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* @var Statement[] |
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*/ |
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private $statements; |
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/** |
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* @param array $policies |
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*/ |
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public function __construct(array $policies) |
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{ |
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$this->policies = $policies; |
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if ( ! isset($this->policies['Statement'])) { |
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throw new \InvalidArgumentException('The policy must have at least one statement.'); |
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} |
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$this->parseStatements($this->policies['Statement']); |
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} |
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/** |
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* @return array |
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*/ |
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public function getStatements() |
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{ |
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return $this->statements; |
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} |
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/** |
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* @param string $action |
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* @param string $resource |
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* @return bool |
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*/ |
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public function canExecuteActionOnResource($action, $resource) |
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{ |
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// TODO([email protected]): Validate action and resource are in valid format |
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$statements = $this->matchStatement($action, $resource); |
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foreach ($statements as $statement) { |
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// If we found a matching statement with an explicit deny, deny right away |
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if ($statement->getEffect()->isDeny()) { |
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return false; |
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} |
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} |
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return ! empty($statements); |
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} |
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/** |
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* @param string $document |
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* @return \tomzx\PolicyEvaluator\Evaluator |
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*/ |
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public static function fromJsonString($document) |
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{ |
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return new self(json_decode($document, true)); |
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} |
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/** |
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* @param array $statements |
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*/ |
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private function parseStatements(array $statements) |
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{ |
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if (empty($statements)) { |
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throw new \InvalidArgumentException('The policy must have at least one statement.'); |
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} |
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foreach ($statements as $statement) { |
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$statement = new Statement($statement); |
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$this->statements[] = $statement; |
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} |
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} |
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/** |
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* @param string $action |
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* @param string $resource |
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* @return array |
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*/ |
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private function matchStatement($action, $resource) |
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{ |
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$statements = []; |
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foreach ($this->statements as $statement) { |
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if ( ! $statement->matchesAction($action)) { |
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continue; |
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} |
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if ( ! $statement->matchesResource($resource)) { |
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continue; |
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} |
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$statements[] = $statement; |
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} |
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return $statements; |
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} |
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} |
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tomzx /
policy-evaluator
